Briquet.



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(Application filed Nov. 29, 1899.)

(No Model.)

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Nrrnn STATES ATENT OFFICE.

LEO G. IIAASE, OF OAK PARK, ILLINOIS, ASSIGNOR TO THE E. d: T. FAIR-BANKS & COMPANY, OF ST. JOHNSBURY, VERMONT.

BRIQUET.

SPECIFICATION forming part of Letters Patent No. 642,979, dated February6, 1900.

Original application filed October 17,1898, Serial No. 693,782. Dividedand this application filed November 29, 1899. Serial No.738,675. (Nomodel.)

To aZZ whom it may concern:

Be it known that I, LEO G. HAASE, a citizen of the United States,residing at Oak Park, in the county of Cook, State of Illinois, haveinvented certain new and useful Improvements in Briquets, of which thefollowing is a description, reference being had to the accompanyingdrawings, and to the letters of reference marked thereon.

The present invention relates to the art of testing cement; and theobject is to provide an improved form of briquet for the carrying out ofthe process claimed in my application filed in the United States PatentOffice October 17, 1898, Serial No. 693,782, the present applicationbeing a division of said other application.

Heretofore cement-testing briquets have been in the form of solid blockswhich were placed in a testing-machine such as shown in the patent to O.C. Miller, No. 313,607, dated March 10, 1885, and subjected to a pullingaction or tensile strain. Much difficulty has been experienced intesting cement by this old process and form of briquet, owing to thefact that this briquet will not break evenly, but will frequently breakbeyond the center by reason of an abnormal lateral or twisting strain.By my improved briquet and the process described in the aforesaidapplication the results attained are uniform to a marked degree.

My invention consists in the matters hereinafter described, and referredto in the appended claims.

In the accompanying drawings, Figure 1 represents a face view of one ofmy improved briquet, the dotted lines showing the same after theapplication of the crushing action. Fig. 2 is a central transversevertical section, and Fig. 3 is an outline of a testing-machine with animproved briquet in position therein.

The improved process claimed in the aforesaid application consists infirst forming the different specimens (varieties) of cement into ringbriquets of a uniform standard section, size, and opening and afterwardsubjecting them successively to accuratelymeasured crushing force in thedirection of their diameters.

In the drawings, A represents the improved briquets as a whole, andthe'preferred form is that of the cross-section of a cylinder or tubeabout three inches in diameter, the wall a of which is one inch wide andone inch thick. By this construction and by using a suitable form ofcompression-clamp, such as shown in the drawings,when the clamp-jaws areforced together the annular briquet will be broken at four points, thusbreaking into four square inches, as shown in dotted lines, or, ifdesired, it may be broken at only two diametricall y opposite points. Inany event the breaking will be uniform, as experiment has proven.

In testing cement by tensile strain upon the solid loriquet 'or thatcommonly called the standard the recorded variations in briquets madefrom the same lot of cement ran as high as one hundred pounds. A seriesof eight tests of cement by my process and annular briquet gave thefollowing resultsviz., four hundred and eighty-four, four hundred andseventy, four hundred and seventytwo, four hundred and ninety-one, fourhundred and seventy, four hundred and sixtysix, four hundred and seventythree, and four hundred and seventy pounds, respectively, which clearlyshows what uniform results are attained thereby, and the briquets usedin these tests were not especially select ed for the purpose.

Having thus described myinvention, what I claim, and desire to secure byLetters Patent, is

1. As a new article of manufacture, a cement-testingbriquet, of annularshape,whose walls in width and thickness are of a definite unit of size;substantially as described.

2. As a new article of manufacture, amolded cement-testing briquet inshape, the crosssection of a tube or cylinder, the thickness and widthof its Walls, and the diameter of its central opening being of the sameunit of size; substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

LEO e. HAASE.

Witnesses:

JOHN KOPPELMEYER, WM. F. HAASE.

